Pitman connection for mowing-machines.



PATBNTED MAR..15, 1904.

F. P. BURKHARDT. PITMAN CONNECTION FOR MOWING MACHINES.

APPLIOATI ON TILED JULY 5, 1902.

I0 MODEL.

UNITED STATES Patented March 15, 1904.

PATENT OFFICE.

FRANKLIN P. BURKHARDT, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE WARDER,BUSHNELL & GLESSNER COMPANY, OF CHICAGO, ILLINOIS,

A CORPORATION OF OHIO.

PITMAN CONNECTION FoR MOWlNG-MACHINES.

SPECIFICATION forming part of Letters Batent No. 754,538, dated March15, 1904. Application filed July 5,1902. serial no. 114,397. (No model.)

- To all whom it may concern: I

Be it known that I, FRANKLIN P. BURK- HARDT, a citizen of the UnitedStates, residing at Chicago, in the county ofCook and State of Illinois,have invented a new and useful Improvement in Pitman Connections forMowing-Machines, of which the following is a specification.

This invention relates to pitman connections 10' for mowing-machines.

The object of the invention is to provide a construction of pitmanconnection which is simple and eflicient in operation.

A further object of the invention is to pro- I 5 vide a construction ofpitman connection for mowing-machines in which provision is made forlubricating the parts and for retaining the lubricant in the connection.

Other objects and features of the invention will appear more. fullyhereinafter.

The invention consists, substantially, in the construction, combination,location, and arrangement of parts, all as will be more fullyhereinafter set forth, as shown in the accom- 2 5 panying drawings, andfinally pointed out in the appended claims.

Referring to the accompanying drawings,

and to the various views and reference-signs appearing thereon, Flgure 11s a view in plan 3 of a construction of pitman connection em- 'bodyingthe principles of my invention, the driving-shaft and -pitman beingbroken 011?. Fig. 2 is a broken view in section on the line 2 2, Fig. 1,looking in the direction of the ar: row. Fig. 3 is a broken view insection on the line 3 3, Fig. 1, looking in the directionof the arrow.

The same part is designated by the same reference-sign wherever itoccurs throughout 4 the several views.

A designates the drive-shaft of a mowingmachine, upon whichis mountedthe fly or balance wheel B in the usual manner. C designates the pitman,through which reciprocations are imparted to the cutter-bar. Only somuch of these parts is shown as is necessary to show the application ofthe invention, and said parts may be of the usual or any suitable,

convenient, or well-known construction and arrangement and embodied inany suitable, 5 convenient, or well-known type of machine, 'so far as myinvention is concerned, which relates to the connection of the pitmanwith the crank or eccentric pin carried by the fly or balance wheel B.

Heretofore it has been customary in many instances to employ a pitmanhaving a forked end, which forked end, in connection with a cap-pieceapplied to such forked end, is arranged to form a bearing for a sleevemounted upon the crank or eccentric pin of the fly or balance Wheel andheld thereon by a nut screwed upon the threaded end of the pin. In suchconstructions, however, it has been difficult to secure eflicientlubrication, for the reason that any lubricant supplied to the bearingof the sleeve upon the crank-pin has been forced out through the ends ofthe sleeve and so wasted, and when the pitman connection is notefficiently supplied with a lubricant the machine works hard and theWear is rapid. It is among the special purposes of my present inventionto overcome these objections and to provide a pitman connection in whichthe lubricant is efliciently retained in the crank or eccentric pinbearing-sleeve and is eificiently applied to the bearing-surfacethereof.

In carrying out my invention I provide a crank or eccentric pin C andinsert the same through a suitable opening formed in the fly 86 orbalance wheel B and firmly driven by hydraulic orother pressure orotherwise into place in the fly or balance wheel, said pin beingpreferably provided with a head or shoulder D to form a bearing againstthe inner or 5 rear face of the fly or balance wheel.

The projecting end of this pin is slightly turned down to a somewhatsmaller diameter than the portion thereof which is received in the flyor balance Wheel, thereby forming a shoulder E 9 thereon, and aboutmidway the length of the projecting end of said pin I form a peripheralgrooveF.

G designates a cap or bearing sleeve having its outer end closed, asindicated at H, and brought to a diameter adapted to receive thereduced'projecting end of the crank or eccentric pin. By reason of theformation of a head D on the end of the crank-pin and the projecting endof the crank-pin beyond the wheel B being reduced, as above described,it will be seen that the crank-pin may be inserted or driven into itsproper seat in the opening through the wheel B from the inside until theprevent escape of the lubricant.

shoulder or head D abuts against the inner face of the wheel. With thisconstruction it will be readily observed when it is desired to removethe crank-pin for repair or renewal or other purpose ahammer-blow uponthe outer end of the pin will be sufficient to drive the pin out, andany hammer-blow required to drive or insertthe" 'pin into itsseat in theopening through wheel B will be received upon the head D, therebyavoiding danger of upsetting that end of the pin upon which is carriedthe cap G or of otherwise bending or injuring the pin. This necessitydoes not exist where it is sought to drive the pin out. Theinner end ofthe sleeve G is adapted to abut against the shoulder E, formed on theprojecting end of the pin C, the bearing of the inner end of said sleeveagainst said shoulder forming a joint to The bearing-sleeve G is ofsomewhat greater length than the length of the projecting end of thepin, thereby forming a chamber J, in which the oil or other lubricantmaybe collected until entirely used up. The sleeve G is provided with anopening therethrough,'adapted to receive therethrough a locking-key K,the edge of said locking-key being received in the'pe ripheral groove F,formed in thepin C, thereby locking sleeve G against endwise movement,while permitting relative rotation of said sleeve and pin, The sleeveGis also provided wlth an opening L ,therethrough,

- through which the lubricant may be introduced tothe bearing-surface ofsaid sleeve, and in order to efficiently spread the lubricant theopening L terminates at its inner end in an extended seat or slot M,(see Fig. 3,) and in order to enable the opening L and seat M to beformed in thesleeve G without materially decreasing the .strengththereofsaid sleeve may be providedwith a projection or enlargement N,(see Fig. 1,) through whichsaid opening L and in which said seat M isformed.

0 P designate the forked arms of the pitman, these arms being threadedat'their outer extremities, and Q designates thecap-piece, having itsends perforated to be received over the forked ends 0 I and nuts R,threaded upon the threaded ends of the forked arms, serving to hold thecap-piece Q in place. The yoke-arms, in conjunction with the cap-pieceQ, constitute, in effect, clamping-jaws and tosleeve G, thus avoidingthe necessity of providing any other or special means for locking saidkey in place, and hence affording amost simple and efficient as well asinexpensive locking device, and this I consider a most important featureof my invention. In order to prevent undue movement of sleeve G in thepitman-bearing thus formed therefor, a pin or stud R may be formed onone of these parts to cooperate with a seat or opening S, formed on theother, as clearly shown in full lines in Fig. 2 and in dotted lines inFig. 3.

It will be observed that the opening L, through which the lubricant issupplied to the bearing of the crank-pin, is located between the wheel Band the point of connection of the pitman to the crank-pin. This speciallocation and arrangement is advantageous, for the reason that in sometypes and construc tions of mowing-machines the traction-wheels are ofsuch diameter as to raise the drivinggearing for the knives to aconsiderable height. Consequently the pitman driving shaft A isfrequently inclined downwardly toward the wheel B in order to bring theeccentric-pinto a suitable height for operating the pitman. By reason ofthis inclined position of the pitman-driving shaft the crank and itsbearing are also downwardly inclined. Therefore bylocating the opening Lat a point closely adjacent to the drive-wheel B the lubricant suppliedtherethrough while tending naturally to gravitate toward the lowermostend of the crank-pin when inclined down- Wardly will in so doingefficiently lubricate the bearing of said pin within bearing-sleeve G.

By the construction above described it will be seen that I provide-anexceedingly simple, inexpensive, and economical construction ofpitmanconnection wherein lubrication is efiiciently provided for and thelubricant retained within the bearing.

Having now set forth the object and nature of my invention and aconstruction embodying the same, what I claim as new and useful and ofmy own invention, and desire to secure by Letters Patent, is

1. In a pitman connection for mowing-machines, the combination with acrank-pin and pitman, of a cap-sleeve closed at one end and receivingthe. crankpin in the other end thereof, said cap-sleeve being mounted inthe end of said pitman and means carried by said sleeve and arranged toengage said pin to prevent relative endwise movement of said sleeve andpin, as and for the purpose set forth.

2. In a pitman connection for mowing-machines, the combination with acrank-pin, of a pitman-rod having a clamping-seat, a bearing cap-sleeveclosed at one end and receiving longitudinally through the other endthereof said crank-pin, said cap-sleeve being received in saidclamping-seat and means carried by said sleeve and arranged to engagesaid pin to prevent relative endwise movement of said sleeve and pin,all combined and arranged as and for the purpose set forth.

3. In a pitman connection for mowing-machines, the combination with acrank-pin having a peripheral groove and a pitman-rod having aclamping-seat, of a bearing, capsleeve closed at the outer end thereofand receiving said crank-pin through the inner end thereof, saidcap-sleeve provided with an opening therethrough to admit the lubricantto the bearing-surface thereof and adapted to be received in saidclamping-seat and means carried by said sleeve arranged to operate inthe groove in said pin to lock these parts against relative endwisemovement, as and for the purpose set forth.

4. In a pitman connection for mowing-machines, an eccentric or crank pinhaving a shoulder or head formed on one end and its projecting endturned down to form a second shoulder, a cap-sleeve having a closed endand received upon the projecting end of said pin, and bearing againstsaid second shoulder,

a pitman-rod, and a clamping-seat carried thereby and adapted to receivesaid cap-sleeve, all combined and arranged as and for the purpose setforth.

. 5. In a pitman connection for mowing-machines, a crank-pin, a cap-sl'eeve mounted thereon, said cap-sleeve being closed at its outer end,there being a peripheral groove formed in said pin, a locking-keyarranged to operate in said peripheral groove to lock said sleeveagainst endwise movement upon said pin, a pitman-rod, and aclamping-seat formed therein for receiving and supporting saidcap-sleeve, all combined and arranged as and for the purpose set forth.

6. In a pitman connection for mowing-machines, a crank-pin having ashoulder or head formed on one end and its projecting end turned down toform a second shoulder, a bearing cap-sleeve arranged to be receivedupon said projecting end, said cap-sleeve being of greater length thanthe length of said projecting end, the outer end of said cap-sleevebeing closed and the inner end forming a bearing against said secondshoulder, an opening being formed through said cap-sleeve to admit alubricant to the bearing-surface thereof, a pitman-rod, and means forclamping said pitman upon said bearing-sleeve, as and for the purposeset forth.

7 In a pitman connection for mowing-machines, the combination with acrank-pin, of a cap -sleeve therefor, said cap-sleeve being closed atone end and provided with a lubricating opening therethrough, saidlubricating-opening terminating in an enlarged recess on the insidesurface of said cap-sleeve, means for locking said sleeve to said pin toprevent relative longitudinal movement thereof, a pit man and means forclamping said pitman upon said sleeve, as and for the purpose set forth.

8. In a pitman connection for mowing-ma chines, a crank-pin, a sleevemounted thereon, there being a peripheral groove formed in said pin, alocking-key arranged to operate in said peripheral groove to lock saidsleeve against .endwlse movement upon said pm, a pltmanrod, and meansfor clamping said rod upon said sleeve, all combined and arranged as andfor the purpose set forth.

,9. In a pitman connection for mowing-machines, a crank-pin, a sleevemounted thereon, there being a peripheral groove formed in said pin, alocking-key arranged to operate in said peripheral groove to lock saidsleeve against endwise movement upon said pin, a pitmanrod', aclamping-seat formed therein for receiving and supporting said sleeve,said clamping-seat also operating to inclose and retain said locking-keyin place,as and for the purpose set forth. I

10. In a pitman connection for mowing-machines, a crank-pin, a sleevemounted thereon, there being a peripheral groove formed in said pin, alocking-key arranged to operate in said peripheral groove, a pitman-rodcarrying a clamping-seat, a cooperating cap-piece, said cap piece andbearing seat cooperating to form a clamp adapted to receive said sleeve,said clamp also serving to inclose and lock said keyin place, as and forthe purpose set forth.

In Witness whereof I have hereunto set my hand, this 3d day of July,1902, in the presence of the subscribing witnesses.

FRANKLIN P. BURKHARDT.

Witnesses: I

A. L. SPRINKLE, E. H. KIMBARK.

